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List:       openvz-users
Subject:    [Users] inaccurate timers with ovzkernel-2.6.18-164.11.1.el5.028stab068.3
From:       dietmar () proxmox ! com (Dietmar Maurer)
Date:       2010-03-09 5:18:01
Message-ID: 90D306BE6EBC8D428A824FBBA7A3113D06B2491B1A () ronja ! maurer-it ! com
[Download RAW message or body]

We run kvm on ovz kernels. But it seems that the latest ovzkernel
has problems with posix timers, so kvm mouse movement in not smooth.
By default kvm uses timer_create() and timer_settime() syscalls.

To show the behavior I use the following command:

 /usr/libexec/qemu-kvm -drive \
file=ubuntu-9.04-desktop-amd64.iso,if=ide,index=2,media=cdrom -m 512 -net none -clock \
dynticks

Everything runs normal when I use any other timer option ('rtc' or 'unix'). For \
example this works perfectly:

 /usr/libexec/qemu-kvm -drive \
file=ubuntu-9.04-desktop-amd64.iso,if=ide,index=2,media=cdrom -m 512 -net none -clock \
unix

I also tested with standard redhat kernel without openvz patches - everything work \
well there.

We run on debian, but you can also reproduce the bug on RHEL/CENTOS with the packages \
provided by opennode:

# wget http://opennode.activesys.org/CentOS/5/opennode/x86_64/RPMS/ovzkernel-2.6.18-164.11.1.el5.028stab068.3.x86_64.rpm
 # wget http://opennode.activesys.org/CentOS/5/opennode/x86_64/RPMS/kmod-kvm-83-105.asys.22.4.x86_64.rpm
 # wget http://opennode.activesys.org/CentOS/5/opennode/x86_64/RPMS/kvm-83-105.asys.22.4.x86_64.rpm


# rpm -i ovzkernel-2.6.18-164.11.1.el5.028stab068.3.x86_64.rpm
# rpm -i kmod-kvm-83-105.asys.22.4.x86_64.rpm
# rpm -i kvm-83-105.asys.22.4.x86_64.rpm

Any ideas whats wrong?

- Dietmar
  


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